The fan was attractively packaged with the blue blades looking pretty sharp. Inside of the box I found voltage reducers that also converted from 3-pin to 4-pin Molex and a bag with screws and plastic mounts.

The SilverStone PS05B case I installed them in was a tool-less install, so I didn't actually need to use any of the mounting hardware. The cable length was plenty long enough to pass through the opening at the top of the case and reach the fan header on the motherboard. I installed both 120mm fans at the top, but I was able to reach two different headers. The airflow diagram was easy to follow as part of the install.

To give you a better idea of just how the fans move air, SilverStone has put together the video below which clearly demonstrates the vortex of airflow they claim the PS121 is capable of creating.

The SilverStone SST-AP121 fans do exactly what they say they will. You can easily feel the solid column of air being pushed through the fans. I used one fan to channel air directly into the CPU cooler's fans. This provided fresh outside air directly to the heatsink. The other one drove air directly to the mid-section of the case where it was able to cool the backside of the VGA card and spread from there.